Half of his eight to stewaet d



2 Sheets-Sheet; 1,

F. P. FULLER. Harrow.

No. 226,448. Patented April 13, 1880 LHMII. ulm" N.|P|'ERS.PHOTO-LITHOGRAPHER. WASHINGTON. D. C.

2 Sheets-Sheet 2.

P. P. FULLER. Harrow.

No. 226,448. f Patented Apri|18,188o.v

MPEIERS. PHoTumoGRAPMEn. WASMNGYBN. n. c.

NiTcn STATES PATENT FRANKLIN P. FULLER, OF MOUNT VERNON, OHIO, ASSIGNOROF ONE- HALF OF HIS RIGHT TO STEVART D. ROBERTS.

HARROW.

SPECIFICATION forming part of Letters Patent No. 226,448, dated April13, 1880.

Application filed February (i, 1880.

To all whom it may concern Be it known that I, FRANKLIN P. FULLER, ofMount Vernon, Ohio, have invented a new and useful Improvement inHarrows, of which the following is a clear, full, and exact description,reference being had to the accompanying drawings, making a part of thisspecification, in which- Figure l is a perspective view of a harrow withmy improvements attached. Fig. 2 is a section through w a: of Fig. 1.Fig. 3 is a detached view of the hinge. Fig. 4 shows details referredto.

My invention refers to that class of harrows which automatically adjustthemselves to the irregularities ot' the ground; and it consists in thecombination of devices hereinafter described and claimed.

To enable others skilled in the art to make and use .my invention, Iwill proceed to describe the exact manner in which I have carried itout.

In the drawings, A A represent the frames 4of two harrows connected bythe hinges B B.

These hinges are formed of the two parts a and b, as shown in Fig. 3.The part c is constructed with a vertical slot, a, of about six inches,in which slides the bolt b', secured between the ears of the part b. Theparts et b are secured by the arms c and b", by screws or otherconvenient means, and by the bolt c'", to the frames A A', and by thisconstruction of the hinge the harrows have a vertical play of six inchesin addition to the ordinary swing of hinged harrows. By my constructinof the hinge either section of the harrow has an independent rise orfall with respect to the other, to accommodate any unevenness of theground, or, in passing over any obstruction, to allow one section, oreither end of one section, to rise while the other section remains inalevel position on the ground.

The cross-bars containing the teeth I make of tough white oak, and inthe center of these I rigidly secure the knees C, through which thecross-bars are controlled and held. By this means more or lesselasticity is secured in the bars, which tends to prevent the teeth frombending or breaking, as they frequently do in solid harrows, whenmeeting with au obstruction.

To the top of each knee is pivoted the longitudinal bar D, carrying onits forward end the pivoted bell-crank lever d, the lower or long arm,e, of which acts as a pawl on the toothed bar E, while the short orupper arm, e', is connected by a rod, F,' to the swinging lever G,attached to the rear end of the longitudinal bar D. This swinging leveris also connected by the rod f to the bell-crank lever g, on the outerend of the main lever H. It is evident that by this arrangement oflevers and connecting-rods the pawl e canv be raised or lowered atpleasure, thereby engaging with or releasing it from the tooth-bar E.

To hold the pawl e squarely on the toothed bar E and secure itssuccessful operation I place on the forward end of the longitudinal barD the guard I, provided with two arms,z' z', which snugly inclose thetoothed bar E on each side, and which hold the pawl e to its properposition on the top of the toothed bar E. The front cross-bar, on whichis secured the toothed bar E, is rigidly secured in the frame A, whileall the other cross-bars are secured so as to partially revolve, for apurpose hereinafterdescribed.

The knee on the rear cross-bar is constructed with the segmentalrack-bar J, and has pivoted to its top the main lever H, with a loop, h,inclosing the segmental rack-bar. Through the upper portion of the looppasses the springbolt It, meshing with the segmental rack. Thisspring-bolt is operated by means of the rod L and small bell-crank leverZ, on the outer end of the lever H.

The operation of this part of my invention is as follows: When theharrow, as shown in Fig. 1, is passing over the ground it is liable tobecome choked with weeds, grass, roots, Ste. In such a case it is onlynecessary to press up the small crank-lever g, which, through the leversG and d and their connectil'lg-rods, will raise and release the pawl c,whereby the teeth of the harrow are allowed to turn back and out of theground, aud in moving its own length the harrow will be' cleared ot thetrash which had accumulated on the teeth,

thus avoiding the annoyance and labor n- Volved in raising the harrowfrom the ground. The operator can then, by means of levers, againreadjust the teeth With one hand to any desired angle or to a verticalposition without stoppin g the team.

I am aware that the teeth of harrows have been made adjustable by meansof levers and bars, and therefore I do not olai n1 these broadly.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In an adjustable harrow, the knees C, lonranged to operate substantiallyas and for the zo purpose described.

FRANKLIN PIERCE FULLER.

Attest:

J ornv D. EWING, A. W. MARSH.

